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From: Len Brown <lenb@kernel.org>
To: x86@kernel.org
Cc: linux-kernel@vger.kernel.org, Len Brown <len.brown@intel.com>
Subject: [PATCH 05/10] x86 tsc_msr: Correct Silvermont reference clock values
Date: Fri, 17 Jun 2016 01:22:47 -0400	[thread overview]
Message-ID: <5d7561655dfb066ff10801b423405bae4d1cfbe2.1466138954.git.len.brown@intel.com> (raw)
In-Reply-To: <20160617052252.25991-1-lenb@kernel.org>
In-Reply-To: <2199d0e959f7f71a18827268b5d060f8d3831639.1466138954.git.len.brown@intel.com>

From: Len Brown <len.brown@intel.com>

Atom processors use a 19.2 MHz crystal oscillator.

Early processors generate 100 MHz via 19.2 MHz * 26 / 5 = 99.84 MHz.

Later preocessor generate 100 MHz via 19.2 MHz * 125 / 24 = 100 MHz.

Update the Silvermont-based tables accordingly,
matching the Software Developers Manual.

Also, correct a 166 MHz entry that should have been 116 MHz,
and add a missing 80 MHz entry.

Reported-by: Stephane Gasparini <stephane.gasparini@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
---
 arch/x86/kernel/tsc_msr.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/arch/x86/kernel/tsc_msr.c b/arch/x86/kernel/tsc_msr.c
index 4110f72..20487e2 100644
--- a/arch/x86/kernel/tsc_msr.c
+++ b/arch/x86/kernel/tsc_msr.c
@@ -35,11 +35,11 @@ static struct freq_desc freq_desc_tables[] = {
 	/* CLV+ */
 	{ 6, 0x35, 0, { 0, 133200, 0, 0, 0, 99840, 0, 83200 } },
 	/* TNG - Intel Atom processor Z3400 series */
-	{ 6, 0x4a, 1, { 0, 99840, 133200, 0, 0, 0, 0, 0 } },
+	{ 6, 0x4a, 1, { 0, 100000, 133300, 0, 0, 0, 0, 0 } },
 	/* VLV2 - Intel Atom processor E3000, Z3600, Z3700 series */
-	{ 6, 0x37, 1, { 83200, 99840, 133200, 166400, 0, 0, 0, 0 } },
+	{ 6, 0x37, 1, { 83300, 100000, 133300, 116700, 80000, 0, 0, 0 } },
 	/* ANN - Intel Atom processor Z3500 series */
-	{ 6, 0x5a, 1, { 83200, 99840, 133200, 99840, 0, 0, 0, 0 } },
+	{ 6, 0x5a, 1, { 83300, 100000, 133300, 100000, 0, 0, 0, 0 } },
 };
 
 static int match_cpu(u8 family, u8 model)
-- 
2.9.0

  parent reply	other threads:[~2016-06-17  5:24 UTC|newest]

Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-06-17  5:22 [PATCH 0/10] x86/tsc: fast calibration updates Len Brown
2016-06-17  5:22 ` [PATCH 01/10] Revert "x86/tsc: Add missing Cherrytrail frequency to the table" Len Brown
2016-06-17  5:22   ` [PATCH 02/10] x86 tsc_msr: Identify Intel-specific code Len Brown
2016-07-10 18:10     ` [tip:x86/timers] x86/tsc_msr: " tip-bot for Len Brown
2016-06-17  5:22   ` [PATCH 03/10] x86 tsc_msr: Remove debugging messages Len Brown
2016-07-10 18:10     ` [tip:x86/timers] x86/tsc_msr: " tip-bot for Len Brown
2016-06-17  5:22   ` [PATCH 04/10] x86 tsc_msr: Update comments, expand definitions Len Brown
2016-07-10 18:11     ` [tip:x86/timers] x86/tsc_msr: " tip-bot for Len Brown
2016-06-17  5:22   ` Len Brown [this message]
2016-07-10 18:11     ` [tip:x86/timers] x86/tsc_msr: Correct Silvermont reference clock values tip-bot for Len Brown
2016-06-17  5:22   ` [PATCH 06/10] x86 tsc_msr: Add Airmont " Len Brown
2016-07-10 18:12     ` [tip:x86/timers] x86/tsc_msr: " tip-bot for Len Brown
2016-06-17  5:22   ` [PATCH 07/10] x86 tsc_msr: Extend to include Intel Core Architecture Len Brown
2016-07-10 18:12     ` [tip:x86/timers] x86/tsc_msr: " tip-bot for Len Brown
2016-06-17  5:22   ` [PATCH 08/10] x86 tsc_msr: Remove irqoff around MSR-based TSC enumeration Len Brown
2016-07-10 18:12     ` [tip:x86/timers] x86/tsc_msr: " tip-bot for Len Brown
2016-07-11 19:33     ` tip-bot for Len Brown
2016-06-17  5:22   ` [PATCH 09/10] x86 tsc: enumerate SKL cpu_khz and tsc_khz via CPUID Len Brown
2016-07-10 18:13     ` [tip:x86/timers] x86/tsc: Enumerate " tip-bot for Len Brown
2016-07-11 19:34     ` tip-bot for Len Brown
2016-06-17  5:22   ` [PATCH 10/10] x86 tsc: enumerate BXT " Len Brown
2016-07-10 18:13     ` [tip:x86/timers] x86/tsc: Enumerate " tip-bot for Len Brown
2016-07-11 19:34     ` tip-bot for Len Brown
2016-07-10 18:09   ` [tip:x86/timers] Revert "x86/tsc: Add missing Cherrytrail frequency to the table" tip-bot for Len Brown
2016-06-17  7:36 ` [PATCH 0/10] x86/tsc: fast calibration updates Thomas Gleixner

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